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Search Results: 1 - 10 of 29605 matches for " Fernando Coda Marques "
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A Yamabe-type problem on manifolds with boundary
Fernando Coda Marques
Matemáticas : Ense?anza Universitaria , 2007,
Abstract: In this article we give a brief survey on a Yamabe-type problem on manifolds with boundary. Given a compact manifold (Mn, g), with nonempty boundary, the problem consists in finding a conformal metric of zero scalar curvature and constant mean curvature on the boundary
Deforming three-manifolds with positive scalar curvature
Fernando Coda Marques
Mathematics , 2009,
Abstract: In this paper we prove that the moduli space of metrics with positive scalar curvature of an orientable compact 3-manifold is path-connected. The proof uses the Ricci flow with surgery, the conformal method, and the connected sum construction of Gromov and Lawson. The work of Perelman on Hamilton's Ricci flow is fundamental. As one of the applications we prove the path-connectedness of the space of trace-free asymptotically flat solutions to the vacuum Einstein constraint equations on $\mathbb{R}^3$.
Minimal surfaces - variational theory and applications
Fernando Coda Marques
Mathematics , 2014,
Abstract: Minimal surfaces are among the most natural objects in Differential Geometry, and have been studied for the past 250 years ever since the pioneering work of Lagrange. The subject is characterized by a profound beauty, but perhaps even more remarkably, minimal surfaces (or minimal submanifolds) have encountered striking applications in other fields, like three-dimensional topology, mathematical physics, conformal geometry, among others. Even though it has been the subject of intense activity, many basic open problems still remain. In this lecture we will survey recent advances in this area and discuss some future directions. We will give special emphasis to the variational aspects of the theory as well as to the applications to other fields.
Grand Challenges in Fuel Cells: Materials Issues at all Length Scales
Fernando M. B. Marques
Frontiers in Energy Research , 2013, DOI: 10.3389/fenrg.2013.00005
A priori estimates for the Yamabe problem in the non-locally conformally flat case
Fernando C. Marques
Mathematics , 2004,
Abstract: Given a compact Riemannian manifold, with positive Yamabe quotient, not conformally diffeomorphic to the standard sphere, we prove a priori estimates for solutions to the Yamabe problem. We restrict ourselves to the dimensions less than or equal to 7, where the Positive Mass Theorem is known to be true. We also show that, when the dimension is greater than or equal to 6, the Weyl tensor has to vanish at a point where solutions to the Yamabe equation blow up.
No Problem? No Research, Little Learning ... Big Problem!
Fernando Ornelas Marques,Maria Teresa Marques
Journal of Systemics, Cybernetics and Informatics , 2012,
Abstract: The motivation to carry out this study stemmed from the generalized perception that nowadays youth lacks the skills for the 21st century. Especially the high-level competences like critical thinking, problem solving and autonomy. Several tools can help to improve these competences (e.g. the SCRATCH programming language), but, as researchers and educators, we are mostly concerned with the skill to recognize problems. What if we do not find problems to solve? What if we do not even feel the need to find or solve problems? The problem is to recognize the problem; the next step is to equate the problem; finally we have to feel the need to solve it. No need? No invention. Recognizing a problem is probably the biggest problem of everyday life, because we are permanently faced with problems (many ill-defined problems), which we need to identify, equate and solve.
Armadillo (Cingulata: Dasypodidae) in the Diet Of the Neotropical Otter Lontra longicaudis in Southern Brazil
Fernando Marques Quintela,Andressa Gatti
IUCN Otter Specialist Group Bulletin , 2009,
Abstract: Claws, hairs and osteoderms of armadillo (Cingulata: Dasypodidae) were found in a scat of a neotropical otter (Lontra longicaudis) in an edge of a pluvial channel near a peat forest in the southern Coastal Plain of Rio Grande do Sul state, southern Brazil. Due to the absence of carrion-eating invertebrates in the sample, it is suggested that the armadillo was actively preyed upon by the otter. This is the first record of armadillo in the diet of Lontra longicaudis.
Morse index and multiplicity of min-max minimal hypersurfaces
Fernando C. Marques,André Neves
Mathematics , 2015,
Abstract: The Min-max Theory for the area functional, started by Almgren in the early 1960s and greatly improved by Pitts in 1981, was left incomplete because it gave no Morse index estimate for the min-max minimal hypersurface. We advance the theory further and prove the first general Morse index bounds for minimal hypersurfaces produced by it. We also settle the multiplicity problem for the classical case of one-parameter sweepouts.
The Willmore conjecture
Fernando C. Marques,André Neves
Mathematics , 2014,
Abstract: The Willmore conjecture, proposed in 1965, concerns the quest to find the best torus of all. This problem has inspired a lot of mathematics over the years, helping bringing together ideas from subjects like conformal geometry, partial differential equations, algebraic geometry and geometric measure theory. In this article we survey the history of the conjecture and our recent solution through the min-max approach. We finish with a discussion of some of the many open questions that remain in the field.
Min-Max theory and the Willmore conjecture
Fernando C. Marques,André Neves
Mathematics , 2012,
Abstract: In 1965, T. J. Willmore conjectured that the integral of the square of the mean curvature of a torus immersed in Euclidean three-space is at least 2\pi^2. We prove this conjecture using the min-max theory of minimal surfaces.
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